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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A346647 a(n) = Sum_{k=0..n} binomial(n,k) * binomial(5*k,k) / (4*k + 1).

Table of values

n a(n)
0 1
1 2
2 8
3 54
4 460
5 4361
6 43988
7 462580
8 5014252
9 55624944
10 628432101
11 7205500484
12 83632219892
13 980710882430
14 11601345881748
15 138278231052451
16 1659037424218780
17 20020306637339944
18 242835190201382648
19 2958961154058610552
20 36203518795424475661

List of values

[1, 2, 8, 54, 460, 4361, 43988, 462580, 5014252, 55624944, 628432101, 7205500484, 83632219892, 980710882430, 11601345881748, 138278231052451, 1659037424218780, 20020306637339944, 242835190201382648, 2958961154058610552, 36203518795424475661]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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